"Constructor com.example.Source(java.lang.String): Parameter 0 from null accepting to non-null accepting breaking change."
            )
            assertHasNoWarning()
            assertHasNoInformation()
        }
    }

    @Test
    fun `from null returning to non-null returning is not breaking`() {

  * When annotating existing internal code, use `org.jetbrains.annotations.Contract`, e.g. `@Contract(null -> null; !null -> !null)`.
      When doing so, still annotate nullable parameters and the return type as `@Nullable`.
  * Do not use `@Contract` for public APIs.
  * For polynull public APIs, the solution has to be decided on a case-by-case basis.

Do not remove `null` checks on public API boundaries, even if the annotations (or rather lack of them) suggest this.

            if (!stage.runsIndependent && prevStage != null) {
                dependOnPreviousStageTrigger(model, prevStage, os)
            }

            snapshotDependencies(dependencies)
        }
    })

fun Dependencies.dependOnPreviousStageTrigger(
    model: CIBuildModel,
    prevStage: Stage,
    os: Os? = null,
) {

                    val someVal: String? = null
                    var someVar: String? = null
                    fun foo(): String? = null
                }
            """
        ) {
            assertHasErrors(
                "Method com.example.Source.foo(): From non-null returning to null returning breaking change.",
                "Method com.example.Source.getSomeVal(): From non-null returning to null returning breaking change.",

                "Constructor com.example.Source(java.util.List): Parameter 0 from null accepting to non-null accepting breaking change."
            )
            assertHasNoWarning()
            assertHasNoInformation()
        }
    }

    @Test
    fun `from null array returning to non-null returning is not breaking`() {

     * @return The property, or null if no such property exists.
     */
    public PropertyMetaData findProperty(String name) {
        PropertyMetaData propertyMetaData = declaredProperties.get(name);
        if (propertyMetaData != null) {
            return propertyMetaData;
        }
        ClassMetaData superClass = getSuperClass();
        if (superClass != null) {
            return superClass.findProperty(name);

                }
            """
        ) {
            assertHasErrors(
                "Method com.example.Source.foo(): From non-null returning to null-unmarked returning breaking change.",
                "Method com.example.Source.baz(): From non-null returning to null-unmarked returning breaking change.",
            )
            assertHasNoWarning()

        @Override
        public void onEndElement(String elementName) {
            if (elementName.equals("table")) {
                currentTable = null;
                header = null;
            }
            if (elementName.equals("tr")) {
                currentRow = null;
            }
            nodes.pop();
        }

        @Override
        public void onText(String text) {

                // That will be handled when the member is passed to `maybeViolation`.
                return null;
            }
            if (member instanceof JApiImplementedInterface) {
                // The changes about the interface's methods will be reported already
                return null;
            }
            if (member instanceof JApiConstructor) {
                if (isInject((JApiConstructor) member)) {

                errors << "From non-null returning to null returning breaking change"
            } else if (oldNullability == Nullability.NON_NULL && newNullability == Nullability.UNMARKED) {
                errors << "From non-null returning to null-unmarked returning breaking change"